Percentage Calculator
Calculate percentages, proportions, and percentage change with a clear formula breakdown.
What this calculator does
Choose a percentage question, enter two values, and get an instant result with the calculation steps.
Inputs and what they mean
- What do you want to work out?
- — choice value.
- First value
- — number value.
- Second value
- — number value.
How to use it
- Choose the percentage question you want to answer.
- Enter both values using whole numbers or decimals.
- Read the result and calculation breakdown.
Formula
A percentage is a share of 100. To take a percentage of a number, divide the percentage by 100 and multiply. To express one number as a percentage of another, divide the part by the total and multiply by 100. Percentage change compares the difference between two numbers against the original value.
Worked example
Find 25% of 200
25 ÷ 100 × 200 = 50.
Reading the result
The headline figure is the main answer. Any breakdown underneath shows the parts that make it up, so you can check the working and see what changes when you adjust an input.
Limitations and assumptions
Results depend entirely on the figures you enter and are rounded for display. They are for general information and education, not professional advice.
Common questions
Related tools
Calculate a value after a percentage increase and see the exact increase amount.
Calculate a value after a percentage decrease and see the exact reduction.